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Anti-corrosion coatings on magnesium alloys serve as a barrier that inhibits external agents such as salt and acid rain from interacting with the alloy surface. By isolating the alloy from air and moisture, these coatings delay the onset of oxidation and corrosion, thereby enhancing the alloy's durability. Consequently, the formulation of such coatings is a critical step in advancing the magnesium alloy industry. This review outlines the types and anti-corrosive mechanisms of coatings for magnesium alloys, namely, organic, inorganic, metallic, and composite coatings. Additionally, various methods for coating preparation are discussed, including hydrothermal methods, chemical vapor deposition, electrodeposition, microarc oxidation, and magnetron sputtering. Finally, the review offers directions and conceptual frameworks for future research on magnesium alloy anti-corrosion coatings. [ABSTRACT FROM AUTHOR]

With the rapid development of the aviation industry, the working conditions of the aero-engines have become even worse. With a rise in inlet temperatures, the aero-engine blades are easily oxidized at high temperature, which consequently reduces their service life. MCrAlY coating (M refers to Fe, Ni, Co, etc.) has good high temperature oxidation resistance. It is considered to be an effective method to solve the problem of high temperature oxidation of aero-engines blades, and has gradually become the current domestic and foreign scholars focus. Arc ion plating is a mature technology for the preparation of MCrAlY coating, which has been paid much attention. Based on the arc ion plating process, and Ni-base superalloy GH4133 for aero-engines blades, coating the surface with NiCrAlY coating, after heat treatment, high temperature oxidation resistance test, at a constant temperature of 920 ℃, continuous oxidation test for 192 h, the micro-morphology, microstructure and oxidation process of the samples were analyzed by SEM, XRD, and EDS. The results: 1) NiCrAlY coating has a high density, there are many fine particles distributed on the surface of the coating, the surface is smooth, no micropores, pits and other defects, the coating and the matrix material formed a close bonding state; 2) after heat treatment, the particles on NiCrAlY coating surface are arranged more closely, the coating changed from NiAl phase to Ni3Al phase, which improved the high temperature oxidation resistance of the coating; 3) during the initial stage of high temperature oxidation, a uniform and dense protective layer of Cr2O3 was formed on the surface of the coating, which effectively prevented the oxygen from diffusing into the inner of the coating, thus greatly improving the anti-oxidation performance; 4) during the oxidation process, the interdiffusion of Cr occurs at the interface between the coating and the substrate, mainly in the form of Cr element diffusing from the coating to the substrate. When the oxide layer Cr2O3 cracks or peels off, a new oxide layer can be formed after the substrate contacts with oxygen, which decreases the rate of oxidation weight gain and continues to play the role of high temperature oxidation protection.

The friction and wear of mechanical parts mainly occurs on the surface of the material, and about 80% of the failures of parts are caused by surface wear.Friction and wear increase the loss of material and energy, and reduce the reliability and safety.Using laser cladding technology to prepare a high entropy alloy coating on the surface of the substrate can achieve a good metallurgical combination between the coating and the substrate, so as to achieve the purpose of improving surface wear resistance.The main factors affecting the wear resistance of the high entropy alloy coating are the mechanical and physical properties of the coating material (such as hardness, plasticity and toughness), defects generated during the cladding process (such as surface roughness, pores and cracks), friction conditions (such as high temperature environment and corrosive environment).In this paper, the influencing factors and strengthening mechanism of laser cladding high entropy alloy coatings were reviewed and summarized.First of all, the influence of laser process parameters (such as laser power, laser scanning speed, spot diameter) and post-treatment processes (such as heat treatment and rolling) on the quality and performance of the coating were explained.Secondly, the influence of component element selection, high temperature environment and corrosive environment on the wear resistance of the coating was described.Finally, the problems existing in the preparation of high entropy alloy coatings by laser cladding technology were analyzed, and the future development trends were forecasted, such as developing new materials based on far-equilibrium material design theory, using electric field-magnetic field synergy or laser-ultrasonic vibration composite technology to improve the wear resistance of coatings, etc.

Amorphous alloy powder can be obtained by rapid cooling atomization of certain alloy droplets. Fe-based amorphous alloy powder has been favored because of its low production cost and wide application range. Moreover, the application of Fe-based amorphous alloy powder provides a new solution for the application of bulk Fe-based amorphous alloys.The research progress of Fe-based amorphous alloy powder was reviewed, and its research status was summarized in four aspects: coating preparation, magnetic materials, laser 3D printing, and wastewater treatment. The advantages of Fe-based amorphous alloy powder in various fields were analyzed, and the research directions of Fe-based amorphous alloy powder in the fields of preparing high-quality coatings, reuse of aging magnetic powders and additive manufacturing were pointed out. Moreover, the application prospects of Fe-based amorphous alloy powder as sensing, control and other functional devices were prospected.In addition, it also shows great application potential in the fields of small size, low dimentional materials such as thin films and flexible electronics.

The ureteral stent is an effective treatment for clinical ureteral stricture following urological surgery, and the functional coating of the stent could effectively inhibit bacterial colonization and other complications. The present review provides an analysis and description of the materials used in ureteral stents and their coatings. Emphasis is placed on the technological advancements of functional coatings, taking into consideration the characteristics of these materials and the properties of their active substances. Furthermore, recent advances in enhancing the therapeutic efficacy of functional coatings are also reviewed. It is anticipated that this article will serve as a valuable reference providing insights for future research development on new drug-loaded ureteral stents. [Display omitted] • Function and clinical treatment significance of ureteral stent and its coating were provided. • Structural stability and interface suitability of different ureteral stents were described. • The structural characteristics and practical applications of ureteral stent coating drug carriers were overviewed. • Process technology and application for preparing ureteral stent coatings were analyzed. • Therapeutic effects and future development of ureteral coating stents are summarized and prospected. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To achieve the goal of carbon neutrality and peak carbon dioxide emissions, and reduce the development and utilization of fossil energy, wind power, as a typical clean energy source, has the advantages of wide distribution, environmental protection and remarkable scale benefits. However, wind turbines installed in cold regions or high-altitude areas often encounter an icing climate during winter operations, which affects the economic benefits and stability of wind power plants. To address the above issues, research has been carried out in recent years on coating with superhydrophobic anti-icing properties. In this review, the theory of solid surface wettability was described, and the mechanism and hazards of wind turbine blade icing were introduced. The preparation methods of superhydrophobic ice-phobic coating were systematically summarized, and the advantages and disadvantages of different methods were discussed based on the current research. To make the superhydrophobic ice-phobic coating have excellent weather resistance in the actual operation of wind turbine blades, a method of adding self-cleaning, anti-corrosion, photothermal conversion and other functions to the original coating was proposed. In addition, the application of superhydrophobic ice-phobic coating in transmission lines, aircraft wings and other fields was briefly described, which provided references for anti-icing research in different industries. [Display omitted] • The wind turbine blade icing mechanism and ice-phobic coating technology were reviewed. • Different methods for the preparation of ice-phobic coating were summarized. • The ice-phobic coating with self-cleaning, anti-corrosion and photothermal properties was introduced. • The existing problems of coating were analyzed and future direction was discussed. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The characteristics and mechanism of the spectral curves of green plants were analyzed in the 4002 500 nm band. On this basis, BaCl2 ⋅ 2H2O, ZnSO4 ⋅ 7H2O and chrome green were used as the basic filler and polyuria was used as a resin matrix to prepare a coating. Test results showed that the coating had a similar spectral curve with green plants in the range of 400-2 500 nm. When compared the spectrum curve with that of mul berry leaves, the correlation coefficient reached 0.9249, the cosine of the similar angle reached 0.9883, and the whole curve fitted the spectral channel green coating requirements. The spectral stability of the coating was tested at high temperature. The results showed that the spectral stability of the coating was good at high tempera ture. The coating could effectively combat the threat of hyperspectral detection technology. [ABSTRACT FROM AUTHOR]

The synthesis of titanium carbide/iron composite from elemental powders by means of self-propagating reactions to be subsequently employed for plasma spray deposition is investigated. The combustion temperature and velocity of propagating front are found to decrease as the amount of iron in the starting mixture increased. In addition, the maximum value of the iron content in the initial mixture allowable for guaranteeing the self-propagating character of the combustion synthesis process is identified. Below this threshold, i.e. 60 wt.%, independently of the iron content, the final products resulted constituted by titanium carbide and iron, being the latter one found as a binder distributed around the carbide grains. In particular, a strong dependence of the grains size of the obtained titanium carbide on the iron content is observed. Once reduced in powder form, the obtained composite, specifically TiC–30 wt.% Fe, is subsequently used for thermal spraying coatings deposition. Adhesion performance, hardness and wear resistance tests results for the obtained coatings by vacuum plasma spraying are also reported. [Copyright &y& Elsevier]

To cope with the shortcomings of nuclear fuel design exposed during the Fukushima Nuclear Accident, researchers around the world have been directing their studies towards accident-tolerant fuel (ATF), which can improve the safety of fuel elements. Among the several ATF cladding concepts, surface coatings comprise the most promising strategy to be specifically applied in engineering applications in a short period. This review presents a comprehensive introduction to the latest progress in the development of Cr-based surface coatings based on zirconium alloys. Part I of the review is a retrospective look at the application status of zirconium alloy cladding, as well as the development of ATF cladding. Following this, the review focuses on the selection process of ATF coating materials, along with the advantages and disadvantages of the current mainstream preparation methods of Cr-based coatings worldwide. Finally, the characteristics of the coatings obtained through each method are summarized according to some conventional performance evaluations or investigations of the claddings. Overall, this review can help assist readers in getting a thorough understanding of the selection principle of ATF coating materials and their preparation processes. [ABSTRACT FROM AUTHOR]